fix(persistence): migrate all pkg/persistence imports to plugins/infra/database and plugins/infra/cache

- Replace db.DB(ctx) with database.DB(ctx) from plugins/infra/database
- Replace db.Redis/db.PrefixedKey/db.GetJSON/db.SetJSON with cachepkg.* from plugins/infra/cache
- Replace pkg/persistence/idgen with pkg/idgen (already exists)
- Replace pkg/persistence/batchwriter with pkg/batchwriter (already exists)
- Replace pkg/persistence/migrator with pkg/migrator (already exists)
- Replace pkg/persistence/logstore with plugins/domain/risk_control/logstore
- Delete defunct pkg/{persistence,cap,message_gateway,push,shared,task}
- Fix vet issues: db alias in domain_test.go, driver_asynq_worker.TaskHandler reference
- Update Makefile architecture guard
- Update docs and skill references
- Update go.mod: gorilla/sessions promotion to direct dependency

plugins/domain/message_gateway/logics.go

@@ -10,8 +10,6 @@ import (
 	"strings"
 	"time"
 
-	pkgmg "github.com/Rain-kl/Wavelet/pkg/message_gateway"
-
 	"gorm.io/gorm"
 )
 
@@ -37,7 +35,7 @@ func bindChannel(ctx context.Context, userID uint64, req BindRequest) (BindingDT
 	if err != nil || channelID == 0 {
 		return BindingDTO{}, errChannelIDRequired
 	}
-	code := pkgmg.NormalizeCode(req.Code)
+	code := NormalizeCode(req.Code)
 	if code == "" {
 		return BindingDTO{}, errCodeInvalid
 	}